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Re: 1972 c20 running problems
How is the idle ? ('It idled "fine" on 4 cylinders ?) Check for a vacuum leak first off. Check any diaphrams for leaks such as Brake booster (if equipped) etc. and all vac. lines,carb mounting too.
My truck had been sitting for years and the fuel pump didn't work at all after all that time. So yeah, test that. Test the plug wires if you have an ohm meter.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.
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